chapter 8 question 7
please help wil mark brainlyest

Answer:

A.)

Two x-intercepts

Step-by-step explanation:

This question pertains to determining the number of x-intercepts a given quadratic equation has. To solve this, the discriminant of the quadratic equation would need to be calculated, which subsequently determines the number of x-intercepts (if repeated D>0 equals two, D=0 equals one and D<0 means none). The exact number for this specific equation could not be calculated due to an unclear part in the question.

The equation y = 0.5x^2 -6x + 3 is an equation of a quadratic function. The x-intercepts of this function can be found by setting y to 0 and solving the equation for x. A quadratic equation, however, can have two, one, or no x-intercepts, depending on its discriminant (D). The discriminant is found with the equation D = b^2 - 4ac from the general form of a quadratic equation which is ax^2+bx+c = 0. If D > 0 the quadratic has two x intercepts, if D = 0 then it has exactly one and if D < 0 it has none.

For our equation (0,5x^2-6x+3), the discriminant (D) could be calculated as: D = (6)^2 - 4*(0,5)*3. After this calculation, we could determine the number of x-intercepts but since this is not fully clarified in the question, we can't provide a definite answer.

https://brainly.com/question/30098550

#SPJ5

The correct answer is B) Yolanda should have found the volume by multiplying 8 by Four-thirds.

Yolanda incorrectly used the formula for volume of a sphere instead of the correct formula. The volume of a sphere is V = (4/3)πr³, not V = four-thirds(8) cubed.

By using the correct formula, Yolanda should have multiplied 8 by four-thirds to find the volume of the sphere, resulting in a different value.

Answer:

divide 300 feet by 50 which is 6, divide 125 ft by 50 which is 2.5. Therefore your dimensions are 6 in by 2.5 in

if you're in putting in the computer it may want 2.5 in fraction form which is 2 1/2 in or in improper fraction form 5/2 in

Read more on Brainly.com - https://brainly.com/question/12218401#readmore

Step-by-step explanation:

The building's dimensions would be 22.5 inches by 12.5 inches on the drawing when the scale of 1 inch represents 10 feet.

The dimensions of the building you have mentioned are 225 feet by 125 feet. Given the scale of 1 inch represents 10 feet, we can calculate the dimensions of the building on the drawing by dividing each dimension of the building by the scale factor.

So, for the first dimension: 225 feet divided by 10 (scale factor) equals 22.5 inches. For the second dimension, 125 feet divided by 10 equals 12.5 inches.

Therefore, the dimensions of the building on the drawing would be 22.5 inches by 12.5 inches.

https://brainly.com/question/29011258

#SPJ11

Answer:

a

Step-by-step explanation:

x>-2

Answer:

D. $2,511

Step-by-step explanation:

First off, we need to write down the facts we know.

There are about 52.177 weeks in a year

Cesar works 28 hours each week

Cesar makes $23 an hour

There are 12 months in a year

Cesar has $3,360 after his monthly expenses

To figure out how many hours are in a "work year," multiply the number of work hours in a week by the number of weeks in a year. In other words, multiply Cesar's 28 hour work week by about 52.177 weeks. That makes 1,456 hours in his work year. That means he makes $33,492 a year. If you multiply $2,511 by the months in a year (12), you get $30132. Finally, subtract his annual salary by $30132 to get $3,360, which is what was left of Cesar's earnings after paying all of his monthly expenses.

Cesar's average monthly expenses, rounded to the nearest dollar, were $2,511.

An expression contains one or more terms with addition, subtraction, multiplication, and division.

We always combine the like terms in an expression when we simplify.

We also keep all the like terms on one side of the expression if we are dealing with two sides of an expression.

Example:

1 + 3x + 4y = 7 is an expression.com

3 + 4 is an expression.

2 x 4 + 6 x 7 – 9 is an expression.

33 + 77 – 88 is an expression.

We have,

Cesar worked every week for the year, which is 52 weeks.

Therefore,

He worked a total of 52 x 28 = 1,456 hours.

If he made $23 an hour, then his total earnings for the year would be

1,456 x $23 = $33,488.

If he saved $3,360 after paying all of his monthly expenses, then his total expenses for the year would be:

$33,488 - $3,360 = $30,128

To find his average monthly expenses, we can divide his total expenses for the year by 12:

= $30,128 ÷ 12

= $2,510.67

Rounding this to the nearest dollar, we get an answer of $2,511

Therefore,

Cesar's average monthly expenses, rounded to the nearest dollar, were $2,511.

Learn more about expressions here:

https://brainly.com/question/3118662

#SPJ3

Answer:

65 non-fiction books need to be shelved

Step-by-step explanation:

This question can be solved using a rule of three.

For each 5 non-fiction books, there are 9 fiction books. How many non-fiction books are there when there are 117 fiction books?

5 non-fiction - 9 fiction

x non-fiction - 117 fiction

[tex]9x = 5*117[/tex]

[tex]x = \frac{5*117}{9}[/tex]

[tex]x = 65[/tex]

65 non-fiction books need to be shelved

Answer:

52

Step-by-step explanat

because 117 -56-9=52

Answer:

A) 32 4/5 divided by 8 1/5

B)  4

Step-by-step explanation:

Answer:

60

Step-by-step explanation:

Divide 6 by 3 = 2 songs per month

times it by 30 (months) = 60 songs per 30 months

Answer:

7 meters

Step-by-step explanation:

The cylinders are congruent, so they both have a radius of 4.6 m and a volume of 148.12π m³.

Volume of a cylinder is:

V = πr²h

Plugging in values and solving for h:

148.12π = π (4.6)² h

h = 7

Answer:

4048.38 J

Explanation:

By using the formula Q=mcΔT

Q = 0.765 × 126 × 42

= 4048.38 J

The quantity of heat required to raise the  temperature is 4048.38 Joules.

Given the following data:

We know that the specific heat capacity of mercury is 126 J/kg°C.

To find how much heat is required to raise the  temperature:

Mathematically, heat capacity or quantity of heat is given by the formula;

[tex]Q = mc\theta[/tex]

Where:

Substituting into the formula, we have:

[tex]Q = 0.765[/tex] × [tex]126[/tex] × [tex]42[/tex]

Quantity of heat, Q = 4048.38 Joules

Therefore, the quantity of heat required to raise the  temperature is 4048.38 Joules.

Read more: https://brainly.com/question/188778

Answer:

Hope this helps...

Step-by-step explanation:

P stands for polynomial time. NP stands for non-deterministic polynomial time. Definitions: Polynomial time means that the complexity of the algorithm is O(n^k), where n is the size of your data (e. g. number of elements in a list to be sorted), and k is a constant.

Now, a German man named Norbert Blum has claimed to have solved the above riddle, which is properly known as the P vs NP problem.

Answer:

The P versus NP is a famous unsolved problem in computer science.

It questions that if every problem whose solution can be rapidly verified can also be solved in limited time.

Hope this helps!

:)

Answer:

0.25

Step-by-step explanation:

1/2 the cards are red and 1/2 are black so it is 0.5 x 0.5

The probability that the first card drawn is a black card and the second is a red card, with replacement, is 1/4 or 25%.

In probability, when we talk about selecting cards with replacements from a deck, the chances of any single card being drawn remain constant regardless of previous draws. A standard deck of cards has 26 black cards and 26 red cards. The probability of drawing a black card is P(Black) = 26/52, and similarly, the probability of drawing a red card is P(Red) = 26/52. When we draw one card, replace it, and then draw again, the outcomes are independent since the replacement restores the deck to its initial state.

The probability of the first card being black and the second card being red is the product of the individual probabilities of each event:

Therefore, the probability that the first card drawn is black and the second is a red card is 1/4 or 25%.

Answer:

mean-175.5

median-18

mode-18

range-11

Step-by-step explanation:

Answer:

(mean 175.5) (median 18) (mode 18) (range 11)

Step-by-step explanation:

Answer:

[tex]\displaystyle y > \frac{1}{4} x+1[/tex]

Step-by-step explanation:

To find the inequality of the shaded area which passes through points (-4, 0) and (4, 2), first we need to find the equation of the line.

To find the equation that passes through (x₁, y₁) and (x₂, y₂), we use this formula:

[tex]\boxed{\frac{y-y_1}{y_2-y_1}=\frac{x-x_1}{x_2-x_1} }[/tex]

Given:

Then:

[tex]\begin{aligned}\frac{y-y_1}{y_2-y_1}&=\frac{x-x_1}{x_2-x_1}\\\\\frac{y-0}{2-0}&=\frac{x-(-4)}{4-(-4)}\\\\\frac{y}{2}&=\frac{x+4}{8}\\\\y&=\frac{1}{4}x+1 \end{aligned}[/tex]

Now, we look at the line in the graph. Since the line is a dotted line, which means that the line is excluded from the shaded area. Then we can only use < or > for the inequality (instead of ≤ or ≥).

Finally, we look at the shaded area. Since the area is above the line, which means the y-value of the area is larger than the y-value of the equation (line), then we will use the larger than sign (>) and the answer will be:

[tex]\displaystyle y > \frac{1}{4} x+1[/tex]

Step-by-step explanation:

1/2x + 4 - 15 = - 3

1/2x - 11 = - 3

1/2x = - 3 + 11

1/2x = 8

x = 8-1/2

x = 7.5

Answer: (0.2215, 0.5785)

Step-by-step explanation:

Given, Trinity takes a sample of 50 songs and finds that 20 are by a female artist.

Let p be the proportion of songs on her phone by a female artist.

Then , the 99% confidence interval for p would be :-

[tex]\hat{p}\pm z\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}[/tex]  ...(i)

As per given , Sample size : n= 50

Sample proportion of songs on her phone by a female artist. [tex]\hat{p}=\dfrac{20}{50}=0.4[/tex]

For 99% confidence level , critical z-value =2.576

Substituting values in (i), we get

[tex]0.4\pm 2.576(\sqrt{\dfrac{0.4(1-0.4)}{50}})\\\\=0.4\pm 2.576\sqrt{0.0048}\\\\\approx0.4\pm0.1785\\\\=(0.4-0.1785,\ 0.4+0.1785)\\\\=(0.2215,\ 0.5785)[/tex]

Hence, a 99% confidence interval for the proportion of songs on her phone by a female artist : (0.2215, 0.5785)

Answer:

68 cm

Step-by-step explanation:

creates 4 "5,12,17" triangles. so multiply 17 by 4 to get 68.

Answer:

80

Step-by-step explanation:

rusher

Answer:

80 hours

Step-by-step explanation:

speed = distance / time

time = distance / speed = 6000/ 75 = 80

Answer:

B

Step-by-step explanation:

Answer:

B 18%

Step-by-step explanation:

14 times .18 or 18% is 2.52. add that to 14 for 16.52 which is the closest to 16.50

Answer:

[tex]f(x)=2x^3+x[/tex]

Step-by-step explanation:

An odd function f is one where [tex]f(-x)=-f(x)[/tex]. We can interpret this is meaning: reflecting the graph horizontally [tex]f(-x)[/tex] has the same effect as reflecting it vertically [tex]-f(x)[/tex] . The only graphs that meet this requirement are ones with reflectional symmetry across the line y = x, so we can immediately elimate the functions [tex]f(x)=3x^2+7[/tex] and [tex]f(x)=5x^2-6[/tex], which have horizontal symmetry, but not the kind of symmetry we're looking for.

That leaves us with [tex]f(x)=2x^3+x[/tex] and [tex]f(x)=4x^3+2x^2[/tex]. One feature of exponents we can utilize is that -1 to an even power is 1, while -1 to an odd power is -1. If we want [tex]f(-x)=-f(x)[/tex], we need to flip the signs of all the coefficients, and we can only do that if all the powers of x are odd. The only function with only odd powers of x is [tex]f(x)=2x^3+x[/tex], and plugging in -x to the function reveals that

[tex]f(-x)=2(-x)^3+(-x)\\f(-x)=-2x^3-x=-(2x^3+x)=-f(x)[/tex]

So [tex]f(x)=2x^3+x[/tex] the only odd function on the list!

Answer:

6

Step-by-step explanation:

per bag

9/3=3 lollipops

6/3=2 peanut butter cups

3/3=1 chocolate

then add them together to get 6

Answer: 6 pieces of candy

Step-by-step explanation:

Assuming lollipops, peanut butter cups, and chocolate are wanted in 3 bags, we would add all the candy together.

9+6+3=18

We have a total of 18 candies. Since we have to split the candy into 3 bags, you would divide 18 by 3.

18/3=6

There will be 6 pieces of candy in each bag.

Answer:

4x  +6

Step-by-step explanation:

(x+4) + (3x+2)

Combine like terms

x+3x   +4+2

4x  +6

To find the sum of the expressions (x+4) and (3x+2), one combines like terms. The sum of the x terms, 1x and 3x, is 4x and the sum of the constants, 4 and 2, is 6. Hence, the sum of the given expressions is 4x + 6.

To find the sum of two expressions, (x+4) and (3x+2), we need to follow a process known as combining like terms. In arithmetic and algebra, 'like terms' are terms that have the same variables and powers. In this case, the 'like terms' are x in (x+4) and 3x in (3x+2).

Adding these two expressions, we get:

(x + 4) + (3x + 2)

To combine like terms, we add the coefficients of the x terms together (1x and 3x) and we add the constants together (4 and 2).

Sum of x terms: x + 3x = 4x

Sum of constants: 4 + 2 = 6

So, the sum of (x + 4) and (3x + 2) is 4x + 6.

https://brainly.com/question/22883622

#SPJ3

Answer:

The slope is -1/3

Answer:

Column A: Domain: B: -6, -3, -2, 0, 2, 3, 5, 8

Column A: Range: A: -2, -1, 9, 2, 3

Step-by-step explanation:

We can derive these answers by looking at the x and y values of each dot. The Domain is represented by the x values, and the Range is represented by the y values.

The answers chosen contain the x and y values that the graph represents.

Answer:

Step-by-step explanation:

Let one of the side = x

So, other side = x - 2

Area = 360 sq.m

x*(x - 2) = 360

x*x - x * 2 = 360

x² - 2x -360 = 0

x² + 18x - 20x  - 18*20 = 0

x(x +18) - 20*(x + 18 ) = 0

(x + 18)(x -20) = 0

{x + 18 is ignored as measurement will not be a negative number}

x - 20 = 0

x = 20

Length of the longer side = 20 m

Answer:

36 sq cm

Step-by-step explanation:

area of kite = diagonal1 * diagonal2/2

area = 18 cm * 4 cm / 2

area = 72 sq cm/2

area = 36 sq cm

Answeer:4 for thr first question

Then 4 for the second and the last question is 8

Step-by-step explanation:

Answer:

Step-by-step explanation: